- 释义：
- n. 隧道，坑道，地道
- 例句：
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They will have to block up the entrance to the tunnel.
他们将不得不封闭通往隧道的入口.
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To build this tunnel we had to cut through the solid rock.
为了修建这条隧道,我们必须凿开坚硬的岩石.
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They came out of the tunnel and thankfully breathed the fresh air.
他们走出地道,贪婪地吸着新鲜空气.
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